Find out why is CNG is preferred as a girl over diesel. Prepare a report on the advantages and disadvantages of CNG as an automobile fuel

Here's what I find  

Explanation:

1. Advantages

(a) Less atmospheric pollution

Low emissions — less CO, CO₂, HC, and NOₓ.

(b) Less noise pollution

CNG engines are quieter than gasoline and diesel

(c) Economic

(i) Lower maintenance costs

(ii) Cheaper fuel than gasoline and diesel.

(d) Safer

CNG cylinders are less dangerous than gasoline and diesel tanks in case of an accident.

(e) Lower maintenance costs

Longer periods between tune-ups and oil changes.

(f) Better performance

An octane rating of approximately 120. Regular gasoline is about 87 octane.  

2. Disadvantages

(a) Higher up-front cost

CNG vehicles are more expensive than the diesel/gasoline versions.  

(b) Shorter range

Shorter range means more frequent fill-ups.

(c) Limited Accessibility

(i) Few makers are building CNG automobiles

(ii) Relatively few CNG fuel stations

(d) Poorer performance

The added weight of the fuel tank reduces acceleration and performance.

(e) Reduced storage space

Bulky fuel tanks reduce cargo space.  

(f) Safety

Gaseous methane requires better engineering to prevent leaks.

since electrons are negative the answer is neagtaive